From: Toine
David thanks for your offer but the question isn't fringing. I would
like to know if an A lens on the A setting and on the manual aperture
setting closes it's aperture blades to the same position. In theory it
should be the same. My lens shows different closing and I'm wondering
if it's normal or some sort of misalignment.
Someone can correct me if I'm wrong ...
It may not be the lens. Using just as an example f/8 ...
I think that with the lens set to the 'A' mode the camera may not stop
the lens down to an exact mechanical aperture if the auto exposure needs
it to be a little more or less.
The camera can choose fractional F-stops that don't show on the display
... like it would display f/8 when the camera actually sets the lens
aperture to f/8 + 1/3 stop, or f/8 - 1/3 stop.
Also, is the actual diameter of the aperture at f/8 the same for the
APS-C sensor as it is on a film frame? [note question mark]
The mechanical stop is going to be f/8 on the film frame.
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